In Newcastle upon Tyne properties, hidden leaks often trace back to pinhole leaks developing in ageing lead supply pipes in pre-1970 properties in fenham and walker or leaking joints in shared risers serving tyneside flats, where the source is not obvious from either flat. Watch for a higher water bill, damp or warm patches on the floor, a hissing sound near pipework, or lower water pressure. Properties such as Victorian terraces, Tyneside flats, Georgian properties in Grainger Town, student HMOs, and modern city-centre apartments are worth checking often, since a leak can run for weeks before it shows.